1. Lacking brilliance or vitality
   "a dull lacklustre life"
   - lackluster [US], lusterless [N. Amer], lustreless [Brit, Cdn] 
2. Lacking lustre or shine
   "staring with lacklustre eyes"
   - lackluster [US], lusterless [N. Amer], lustreless [Brit, Cdn]

See also: dull, hebetudinous

• turnout
• turnover
• turnover rate
• turnpike
• turnround
• turnspit
• turnstile
• turnstone
• turntable
• turnup
• turnverein
• TURP
• turpentine
• turpentine camphor weed
• turpentine weed
• turpeth
• Turpin
• turpitude
• turps
• turquoise
• turreae
• turret
• turret clock
• turreted
• Turritis